Sexual energy concerns a great deal more than physical lovemaking: It holds a key to the sustained regeneration of relationships over long periods of time.As most people have probably noticed, the physical aspects of sexual attraction are often prominent in the early stages of a close relationship and tend to recede in prominence as time goes on. Many long-term couples complain about this aspect of sex. They want sexuality to have the same hot and electric qualities that it had when they first felt the attraction to each other. When the heat diminishes, they panic and try to find ways to turn it up again.This effort is missing both the point and the potential. Here is our advice, which many couples have said changed their lives: When the physical aspect of sex begins to fade, don’t try to keep things the way they are. There is a natural progression in sex from physical to emotional to spiritual—and back again to the physical—but this progression must be accepted fully if it is to flow smoothly.